(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Publishing Venue

Abstract

Disclosed is a method of HDD(Hard Disk Drive) performance and reliabi improvement.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

This is the abbreviated version, containing approximately
52% of the total text.

Page 1 of 3

Thermal Adaptive Equalization of HDD Data Read/Write Channel

Disclosed is a method of HDD(Hard Disk Drive) performance and reliabiimprovement.

This invention aimed at improvement of·Error Rate of HDD in varioustemperature conditions.

The improvement was accomplished by optimizing tap weight in channeleach temperature conditions.

First, I explained what is the Equalization, and what is the Tap WeigThen, I described a present problem and a solution to the problem.

What is Equalization, What is Tap Weight ---------------------------

In HDD technology, we write down a digital signal on a disk as a chanthe direction of a magnetic field.

But, to some extent, the wave form of the data read from the disk isfrom an optimum frequency characteristic to the method of signal procin the machines.

That was why we need to arrange the wave form to bring it to be closeoptimum one for the method of signal processing. We call this "Equali

We have used DEQ(Direct EQualization) as one method of equalization.In DEQ, we use FIR(Finite Impulse Response) filter to equalize, and csome coefficients of filter (we call this "Tap Weight".) and sampling

A present problem --------------------------------------------------

Even for the same HDD, an impulse response varies with the temperaturconditions in which HDD be placed.

Because, the signal read by the head from disk changes with change ofcoercivity(coercivity:the volume of external magnetic field to makemagnetization zero) and flying height(flying height:an aperture betwehead and disk surface when disk revolves) depending on temperature co

A change of an impulse response depending on a temperature means a chof tap weight value.

Therefore, if a temperature changed, we cannot equalize optimally altuse a tap weight which is optimized for a certain temperature conditiAs a r...